Current answer
Crossref experienced a critical incident: Metadata Plus REST API not validating API keys. ServiceAlert observed recovery on Oct 5, 2026.
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Incident Lifecycle
Affected Components
Plus REST API
Incident Timeline
Monitoring
A fix has been implemented and we are continuing to monitor the performance of the Metadata Plus pool.
Oct 5, 2026 at 1:01 PM UTC
Investigating
We are continuing the investigate the outage. The Plus pool was down between 12:00 and 12:36 on 5 Oct, 2026.
Oct 5, 2026 at 12:49 PM UTC
Investigating
The API is back up but we are still investigating and monitoring.
Oct 5, 2026 at 12:41 PM UTC
Investigating
Request to the Metadata Plus pool of the REST API are receiving 401 responses (access denied). We are investigating the cause.
Oct 5, 2026 at 12:21 PM UTC
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